CN108117221B - Treatment method of reverse osmosis concentrated water - Google Patents

Treatment method of reverse osmosis concentrated water Download PDF

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CN108117221B
CN108117221B CN201611072017.3A CN201611072017A CN108117221B CN 108117221 B CN108117221 B CN 108117221B CN 201611072017 A CN201611072017 A CN 201611072017A CN 108117221 B CN108117221 B CN 108117221B
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fstb
paracoccus
treatment
salt
cod
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CN108117221A (en
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高会杰
郭志华
孙丹凤
赵胜楠
陈明翔
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China Petroleum and Chemical Corp
Sinopec Fushun Research Institute of Petroleum and Petrochemicals
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China Petroleum and Chemical Corp
Sinopec Fushun Research Institute of Petroleum and Petrochemicals
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    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F9/00—Multistage treatment of water, waste water or sewage
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/72—Treatment of water, waste water, or sewage by oxidation
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/72—Treatment of water, waste water, or sewage by oxidation
    • C02F1/722—Oxidation by peroxides
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/72—Treatment of water, waste water, or sewage by oxidation
    • C02F1/725—Treatment of water, waste water, or sewage by oxidation by catalytic oxidation
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/72—Treatment of water, waste water, or sewage by oxidation
    • C02F1/78—Treatment of water, waste water, or sewage by oxidation with ozone
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00—Biological treatment of water, waste water, or sewage
    • C02F3/34—Biological treatment of water, waste water, or sewage characterised by the microorganisms used

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  • Life Sciences & Earth Sciences (AREA)
  • Hydrology & Water Resources (AREA)
  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Purification Treatments By Anaerobic Or Anaerobic And Aerobic Bacteria Or Animals (AREA)
  • Micro-Organisms Or Cultivation Processes Thereof (AREA)
  • Separation Using Semi-Permeable Membranes (AREA)

Abstract

The invention relates to a method for treating reverse osmosis concentrated water, which mainly comprises the following steps: (1) advanced oxidation unit: carrying out advanced oxidation treatment on the reverse osmosis concentrated water to improve the biodegradability of the RO concentrated water; (2) performing biological strengthening treatment: the wastewater after oxidation treatment enters a biological strengthening treatment unit, and a salt-tolerant COD-removing denitrification microbial agent is added into a treatment system, wherein the microbial agent contains paracoccus (a)Paracoccus sp.) FSTB-2, Microbacterium beiense (F.), (Microbacterium kitamiense) FSTB-4, Pseudomonas stutzeri (Pseudomonas stutzeri) At least one of FSTB-5, and Paracoccus denitrificans (B)Paracoccus denitrificans) DN-3 and Methylobacterium (M) ((M))Methylobacterium phyllosphaerae) At least one of SDN-3. The invention adopts a combined process of advanced oxidation treatment and biological strengthening treatment, and adds a specific salt-tolerant microbial agent into a biological strengthening treatment unit, thereby realizing the simultaneous efficient removal of COD and total nitrogen in RO concentrated water, and the effluent meets the discharge requirement.

Description

Treatment method of reverse osmosis concentrated water
Technical Field
The invention belongs to the technical field of environment-friendly wastewater treatment, and particularly relates to a treatment method of reverse osmosis concentrated water.
Background
Reverse Osmosis (RO), which is widely used in advanced treatment and recycling of industrial wastewater, produces concentrated water with a high concentration of pollutants while producing pure recycled water, the amount of the concentrated water is 1/3 of the amount of the recycled water, and the COD of such wastewater generally exceeds the discharge standard and cannot be directly discharged. In the process of recycling sewage in the oil refining industry, COD (chemical oxygen demand) of concentrated water generated by reverse osmosis treatment is about 200mg/L generally, total nitrogen is about 100mg/L, and petroleum is about 10mg/L, TDS (soluble total solid) which is not less than 5000mg/L, B/C, so that the concentrated water treatment difficulty is extremely high. Therefore, the treatment of reverse osmosis concentrated water has become a bottleneck problem of membrane technology in the field of sewage recycling.
The domestic and foreign treatment methods for reverse osmosis concentrated water comprise methods for improving recovery rate, directly or indirectly discharging, comprehensively utilizing, evaporating and concentrating and the like, the methods do not fundamentally remove pollutants, the comprehensive utilization has great limitation on waste water with complex pollutant components, and the evaporating and concentrating have overhigh energy consumption and cannot be borne by most enterprises. Therefore, the key point for solving the problem of treatment of reverse osmosis concentrated water is to find a treatment method for efficiently degrading pollutants.
The biological method in the sewage treatment method is most economical, but the conventional biological method cannot achieve ideal treatment effect due to poor biodegradability and high salt content of reverse osmosis concentrated water. The discovery of some halotolerant bacteria provides technical support for the biochemical treatment of high-salinity sewage. Xinxin and the like (biological enhancement technology for treating high-salt-content organic wastewater, water treatment technology, 2008, 8: 66-70) adopt the biological enhancement technology to treat the high-salt-content organic wastewater, the dehydrogenase activity of activated sludge of a saponin wastewater biological treatment system biologically enhanced by halotolerant bacteria is obviously improved, and the COD removal rate of the saponin wastewater is 84.41% when the concentration of chloride ions endured by the system is up to 2.8%. CN200810171744.4 discloses a method for treating or recycling high-salt-content wastewater and application thereof, and the method is suitable for standard-reaching discharge or recycling of concentrated solution before membrane in a membrane separation process, and is also suitable for treating and recycling high-salt-content wastewater and upgrading of the conventional engineering transformation. However, the method can be realized only by adding the American engineering flora, and the application is limited to a certain extent.
CN201210130657.0, CN201210130644.3, CN201010536065.X and CN201210130658.5 relate to A method for biologically treating ammoniA nitrogen, total nitrogen and chemical oxygen demand in salt-containing wastewater and catalytic cracking catalyst wastewater by adopting CockerA palustris FSDN-A, Staphylococcus cohnii FSDN-C, Arthrobacter FDN-1, Flavobacterium aquatile FDN-2, Paracoccus denitrificans DN-3 and Methylobacterium SDN-3. The COD treatment by the method is mainly realized by removing nitrite through denitrification, the treatment capacity is limited, and the application range is limited to a certain extent.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a method for treating Reverse Osmosis (RO) concentrated water. The invention adopts a combined process of advanced oxidation treatment and biological strengthening treatment, and adds a specific salt-tolerant microbial agent into a biological strengthening treatment unit, thereby realizing the simultaneous efficient removal of COD and total nitrogen in RO concentrated water, and the effluent meets the discharge requirement.
The invention relates to a treatment method of reverse osmosis concentrated water, which mainly comprises the following treatment units:
(1) advanced oxidation unit: carrying out advanced oxidation treatment on the reverse osmosis concentrated water to improve the biodegradability of the RO concentrated water;
(2) performing biological strengthening treatment: the wastewater after oxidation treatment enters a biological strengthening treatment unit, and a salt-tolerant COD-removing denitrification microbial agent is added into a treatment system, wherein the microbial agent contains paracoccus (a)Paracoccus sp.) FSTB-2, Microbacterium beiense (F.), (Microbacterium kitamiense) FSTB-4, Pseudomonas stutzeri (Pseudomonas stutzeri) At least one of FSTB-5, and Paracoccus denitrificans (B)Paracoccus denitrificans) DN-3 and Methylobacterium (M) ((M))Methylobacterium phyllosphaerae) At least one of SDN-3, wherein paracoccus FSTB-2, Microbacterium beige FSTB-4 and Pseudomonas stutzeri FSTB-5 have been preserved in the China general microbiological culture Collection center (CGMCC) in 6 months and 1 days 2015, and the preservation numbers are respectively CGMCC No.10938, CGMCC No.10939 and CGMCC No. 10940; and (4) storage address: the institute of microbiology, national academy of sciences No.3, Xilu No.1, Beijing, Chaoyang, Beijing. Wherein the paracoccus FSTB-2 is published in CN201510737219.4 and submitted with a deposit and a survival certificate; microbacterium beijerinckii FSTB-4 was filed in CN201510737150.5 and submitted for preservation and proof of survival; pseudomonas stutzeri FSTB-5 was filed in CN201510737176.X and submitted for deposit and proof of survival. The paracoccus denitrificans DN-3 and the methylobacterium SDN-3 are disclosed in CN102465104A and CN102465103A, and the preservation numbers are CGMCC No.3658 and CGMCC No.3660 respectively.
In the invention, the reverse osmosis concentrated water refers to high-salt COD-containing concentrated water generated by reverse osmosis treatment, the concentration of COD (Cr method, the same below) is generally 300mg/L, the B/C ratio is less than 0.2, the total nitrogen concentration is 15-150mg/L, and the TDS (total dissolved solids) is more than 5000 mg/L.
In the invention, the step advanced oxidation unit is mainly used for improving the biodegradability of the reverse osmosis concentrated water. The advanced oxidation may employ conventional advanced oxidation techniques such as fenton oxidation, ozone oxidation, and the like, with ozone catalytic oxidation being preferred. The conditions of the catalytic oxidation by ozone are as follows: the volume space velocity is 0.4-0.8h-1；O3The concentration is 40-80g/m3，O3The dosage is 1000-3000 mg/L. The ozone catalyst can be a commercially available catalyst or a catalyst prepared by the prior art patent, such as the catalyst prepared by the methods described in patents CN201410706824.0, CN201410706825.5, CN201310620750.4 or CN201310621081.2, and the loading amount is 1/4-1/3 of the volume of the reactor. After oxidation treatment, the B/C ratio of the waste water is more than 0.3. The redundant ozone after the oxidation treatment can enter a buffer tank firstly, and then enters a biochemical treatment unit after the ozone is removed.
In the invention, the bioaugmentation treatment unit can adopt the existing biochemical treatment process, and preferably adopts the SBR process. The SBR reactor firstly inoculates activated sludge according to the sludge concentration of 2000-3000mg/L, and then adds salt-tolerant COD-removing denitrification microbial agent. The adding amount of the microbial inoculum is 0.01-1.0% of the volume of the wastewater treated per hour. The COD of the treated drainage is less than 50mg/L, and the total nitrogen is less than 15mg/L, thereby meeting the discharge requirement. The operating conditions of the SBR are as follows: 2-3 sets of SBR series can be selected to alternately run, the running time of the SBR series in a single set is 8-12h, aeration is carried out for 2-6h, stirring is carried out for 1-4h, single series is circulated for 1-3 times, sedimentation is carried out for 1h, and water drainage is carried out for 1 h. The temperature is controlled to be 20-40 ℃, the pH value is 6.0-9.0, and the dissolved oxygen is 1.0-5.0mg/L in the treatment process.
In the salt-tolerant COD-removing denitrification microbial agent used by the invention, the volume ratio of at least one of Paracoccus denitrificans DN-3 and/or Methylobacterium SDN-3 to Paracoccus FSTB-2, Microbacterium beijerinckii FSTB-4 and Pseudomonas stutzeri FSTB-5 is 1: 1-5. (the cell volume was obtained by centrifugation at 1 ten thousand rpm for 5 minutes after the culture, based on the cell volume, the same applies hereinafter). Paracoccus denitrificans DN-3 and methylobacterium SDN-3 can be one of the two or can be mixed thallus of the two in any proportion. Preferably contains both Paracoccus FSTB-2 and Pseudomonas stutzeri FSTB-5. More preferably, five strains of paracoccus denitrificans DN-3, methylobacterium SDN-3, paracoccus FSTB-2, Microbacterium beiense FSTB-4 and Pseudomonas stutzeri FSTB-5 are simultaneously contained.
In the microbial agent, the colony color of the paracoccus FSTB-2 is beige, the individual strain is spherical, gram stain is negative, oxidase is positive, catalase is negative, various carbon sources can be decomposed and utilized, and the microbial agent has nitrate reduction activity. The colony color of the Peganella taiwanensis FSTB-4 is light grayish brown, the individual strain is rod-shaped, gram-positive, oxidase-negative and catalase-positive, can decompose and utilize various carbon sources, and has the nitrate reduction characteristic. The colony color of the pseudomonas stutzeri FSTB-5 is light ginger yellow, the individual strain is rod-shaped, gram-negative, oxidase-negative and catalase-positive, has nitrate reduction performance, and can decompose and utilize various carbon sources. The paracoccus FSTB-2, the Microbacterium beijerinckii FSTB-4 and the Pseudomonas stutzeri FSTB-5 can be independently applied to the high-efficiency removal of COD in the salt-containing wastewater with the salt content of 1.0-5.0 wt%.
The preparation method of the salt-tolerant COD-removing denitrification microbial agent comprises the following steps:
(1) respectively inoculating paracoccus FSTB-2, Microbacterium beijerinckii FSTB-4 and Pseudomonas stutzeri FSTB-5 on an FSTB solid culture medium for activation; respectively inoculating paracoccus denitrificans DN-3 and methylobacterium SDN-3 on corresponding solid culture media for activation;
(2) inoculating paracoccus FSTB-2, Microbacterium beijerinckii FSTB-4 and Pseudomonas stutzeri FSTB-5 colonies on the flat plate into corresponding FSTB liquid culture solutions respectively by using an inoculation ring, inoculating paracoccus denitrificans DN-3 and Methylobacterium SDN-3 colonies on the flat plate into corresponding liquid culture solutions respectively by using the inoculation ring, and culturing for 24-72 hours to a logarithmic growth phase under the conditions of 20-40 ℃ and 150-240rpm to obtain liquid microbial inoculum seed solutions;
(3) and (3) after the seed liquid is amplified and cultured, collecting thalli, and mixing according to a required proportion to obtain the salt-tolerant microbial agent.
The invention isThe formula of the FSTB liquid culture medium used for activating the thallus of paracoccus FSTB-2, Microbacterium beijerinckii FSTB-4 and Pseudomonas stutzeri FSTB-5 related to the microbial agent and culturing the seed liquid is as follows: FeSO4•7H2O 25mg/L，NH4NO3 286mg/L，KCl 929mg/L，CaCl22769mg/L, NaCl 21008mg/L, beef extract 5g/L, peptone 10g/L, and pH 6.0-8.0. The formula of a culture medium used for activation of the DN-3 thallus of the paracoccus denitrificans and culture of a seed solution is as follows: KNO31g/L, sodium succinate 8g/L, KH2PO4 1g/L，FeCl20.5 g/L. The formula of a culture medium for activating methylobacterium SDN-3 thalli and culturing a seed solution is as follows: ammonium sulfate 0.5g/L, methanol 0.75mL/L, KH2PO41g/L，FeCL20.5 g/L. The solid medium was the liquid medium described above to which 2% agar was added.
The culture solution used for the amplification culture of the strain related to the microbial agent can be a salt-containing liquid culture medium containing nitrogen containing COD, and can also be salt-containing actual wastewater containing nitrogen containing COD, wherein the salt concentration is 5000-10000mg/L, the COD is 200-20000mg/L, and the total nitrogen is 50-1000 mg/L. The culture conditions are that the temperature is 20-40 ℃, the pH is 6.0-8.0, and the dissolved oxygen is 0.1-3.0 mg/L. The scale-up culture reactor used in the present invention may be a structure having a good aeration and agitation system.
The invention realizes the simultaneous high-efficiency removal of COD and total nitrogen in the reverse osmosis concentrated water by coupling the advanced oxidation unit with the biological strengthening treatment unit taking the salt-resistant COD-removing denitrification microbial inoculum as the core, the effluent meets the discharge requirement, and the problem of removing pollutants in the RO concentrated water is solved. After the treatment by the method, the COD concentration in the wastewater is less than 50mg/L, and the total nitrogen is less than 15 mg/L.
The several microorganisms in the salt-tolerant COD-removing denitrification microbial agent are cooperatively matched, and the group effect of the bacterial strains improves the tolerance to the salt-containing wastewater, so that the treatment effect on total nitrogen and COD in the wastewater is improved. The conventional pollutants in the RO concentrated water treated by the method reach the standard and can be comprehensively utilized according to requirements.
Detailed Description
According to the RO concentrated water treatment method provided by the invention, the wastewater firstly enters the advanced oxidation unit, so that the biodegradability of the wastewater is improved, and the B/C ratio is more than 0.3 after oxidation; then enters a biological strengthening treatment unit, and high-efficiency treatment is realized by adding salt-tolerant COD-removing denitrification microbial agent.
Example 1 preparation method of microbial inoculum.
(1) Respectively inoculating paracoccus FSTB-2, Microbacterium beijerinckii FSTB-4 and Pseudomonas stutzeri FSTB-5 on an FSTB solid culture medium for activation; respectively inoculating paracoccus denitrificans DN-3 and methylobacterium SDN-3 on corresponding solid culture media for activation; after being evenly coated, the mixture is placed in a constant temperature incubator with the temperature of 35 ℃ for activation.
(2) Bacterial colonies of paracoccus FSTB-2, microbacterium beige FSTB-4 and pseudomonas stutzeri FSTB-5 on the plate are taken by an inoculation ring and inoculated into corresponding FSTB liquid culture media respectively, bacterial colonies of paracoccus denitrificans DN-3 and methylobacterium SDN-3 on the plate are taken by the inoculation ring and inoculated into corresponding liquid culture media respectively, and shake culture is carried out for 48 hours to logarithmic phase at the temperature of 30 ℃ and 150rpm, so as to obtain liquid microbial inoculum seed liquid.
(3) Respectively carrying out amplification culture on paracoccus FSTB-2, micrococcus beiensis FSTB-4, pseudomonas stutzeri FSTB-5, paracoccus denitrificans DN-3 and methylobacterium SDN-3 seed solutions in a reactor with good aeration and stirring conditions, wherein the COD concentration in the culture solution is 2000mg/L, the total nitrogen concentration is 100mg/L, the salt content is 2.5wt%, and the pH value is 8.0. The culture conditions were all: the temperature is 30 ℃, the dissolved oxygen is 2.0-3.0mg/L, and the culture time is 72 hours, thereby obtaining the concentrated bacterial liquid of five strains.
The concentrated bacterial liquid obtained by amplification culture is collected, and paracoccus FSTB-2, microbacterium beige FSTB-4, pseudomonas stutzeri FSTB-5, paracoccus denitrificans DN-3 and methylobacterium SDN-3 are prepared according to the proportion shown in table 1, and are specifically shown in table 1.
Table 1 composition and ratio of the salt tolerant microbial agents.
Figure 84454DEST_PATH_IMAGE001
Example 1
The RO concentrated water produced by a certain oil refinery has COD of 200mg/L, total nitrogen of 100mg/L, salt concentration of 5000mg/L and B/C ratio of less than 0.1. The wastewater treated by the method of the invention firstly enters an ozone catalytic oxidation unit, the catalyst prepared in CN201310621081.2 in example 1 is filled into a reactor, the filling amount is 1/3 of the volume of the reactor, and the test conditions are as follows: volume space velocity of 0.5h-1；O3The concentration is 60g/m3，O3The dosage is 3000 mg/L. The B/C of the effluent of the ozone catalytic oxidation unit is improved to 0.7. And (4) the sewage after ozone oxidation enters a buffer tank to remove residual ozone. Then entering a biological strengthening treatment unit according to the designed water amount, adopting two groups of SBR to alternately run, wherein the running time of a single group of SBR is 12h, aerating for 3h, stirring for 2h, circulating twice, settling for 1h, and draining for 1 h. The treatment temperature is 30 ℃, the pH is 7.0-8.0, and the dissolved oxygen is 2.0-3.0 mg/L. The SBR reactor is added with a salt-tolerant microbial agent No.1 according to 0.1 percent of the volume of the wastewater treated per hour, the COD of the treated wastewater is less than 50mg/L, the total nitrogen is less than 15mg/L, and the effluent meets the discharge requirement.
Example 2
The RO concentrated water produced by a certain oil refinery has COD of 100mg/L, total nitrogen of 80mg/L, salt concentration of 5000mg/L and B/C ratio of less than 0.1. The wastewater treated by the method of the invention firstly enters an ozone catalytic oxidation unit, the catalyst prepared in CN201310621081.2 in example 1 is filled into a reactor, the filling amount is 1/3 of the volume of the reactor, and the test conditions are as follows: volume space velocity of 0.5h-1；O3The concentration is 50g/m3，O3The dosage is 2000 mg/L. The B/C ratio of the effluent of the ozone catalytic oxidation unit is improved to 0.7. And (4) the sewage after ozone oxidation enters a buffer tank to remove residual ozone. Then entering a biological strengthening treatment unit according to the designed water amount, and adopting three groups of SBR processes which alternately run for treatment, wherein the running time of the SBR of a single group is 8 hours, aeration is carried out for 2 hours, stirring is carried out for 1 hour, circulation is carried out for 2 times, sedimentation is carried out for 1 hour, and water drainage is carried out for 1 hour. The treatment temperature is 30 ℃, the pH is 7.0-8.0, and the dissolved oxygen is 2.0-3.0 mg/L. Adding a salt-tolerant microbial agent No. 2 into the SBR reactor according to 0.1 percent of the volume of the wastewater treated per hour, and performing treatmentAfter treatment, the COD of the discharged water is less than 50mg/L, the total nitrogen is less than 15mg/L, and the discharged water meets the discharge requirement.
Example 3
The RO concentrated water produced by a certain oil refinery has COD of 300mg/L, total nitrogen of 150mg/L, salt concentration of 5000mg/L and B/C ratio of less than 0.1. The wastewater treated by the method of the invention firstly enters an ozone catalytic oxidation unit, the catalyst prepared in CN201310621081.2 in example 1 is filled into a reactor, the filling amount is 1/3 of the volume of the reactor, and the test conditions are as follows: volume space velocity of 0.5h-1；O3The concentration is 70g/m3，O3The dosage is 3000 mg/L. The B/C of the effluent of the ozone catalytic oxidation unit is improved to 0.8. And (4) the sewage after ozone oxidation enters a buffer tank to remove residual ozone. Then entering a biological strengthening treatment unit according to the designed water amount, and adopting two groups of SBR processes which alternately run for treatment, wherein the running time of the SBR in a single group is 12 hours, aeration is carried out for 3 hours, stirring is carried out for 2 hours, circulation is carried out twice, sedimentation is carried out for 1 hour, and water drainage is carried out for 1 hour. The treatment temperature is 30 ℃, the pH is 7.0-8.0, and the dissolved oxygen is 2.0-3.0 mg/L. The SBR reactor is added with a salt-tolerant microbial agent No.3 according to 0.1 percent of the volume of the wastewater treated per hour, the COD of the treated wastewater is less than 50mg/L, the total nitrogen is less than 15mg/L, and the effluent meets the discharge requirement.
Comparative example 1
The processing technique and the operating conditions are the same as those of the example 1, except that: salt-tolerant bacteria agent is not added. After treatment, the COD concentration of the discharged water is 100mg/L, the total nitrogen concentration is 60mg/L, and pollutants in the RO concentrated water can not meet the discharge requirement.
Comparative example 2
The processing technique and the operating conditions are the same as those of the example 1, except that: has not been subjected to catalytic ozonation. After treatment, the COD of the discharged water is 150mg/L, the total nitrogen is 80mg/L, and the pollutants in the RO concentrated water can not meet the discharge requirement.

Claims (10)

1. A treatment method of reverse osmosis concentrated water is characterized by comprising the following treatment units:
(1) advanced oxidation unit: carrying out advanced oxidation treatment on the reverse osmosis concentrated water to improve the biodegradability of the RO concentrated water;
(2) performing biological strengthening treatment: the wastewater after oxidation treatment enters a biological strengthening treatment unit, and a salt-tolerant COD-removing denitrification microbial agent is added into a treatment system, wherein the microbial agent contains paracoccus (a)Paracoccus sp.) FSTB-2, Microbacterium beiense (F.), (Microbacterium kitamiense) FSTB-4, Pseudomonas stutzeri (Pseudomonas stutzeri) At least one of FSTB-5, and Paracoccus denitrificans (B)Paracoccus denitrificans) DN-3 and Methylobacterium (M) ((M))Methylobacterium phyllosphaerae) At least one of SDN-3, wherein paracoccus FSTB-2, Microbacterium beige FSTB-4 and Pseudomonas stutzeri FSTB-5 have been preserved in the China general microbiological culture Collection center (CGMCC) in 6 months and 1 days 2015, and the preservation numbers are CGMCC No.10938, CGMCC No.10939 and CGMCC No.10940 respectively.
2. The method of claim 1, wherein: the reverse osmosis concentrated water refers to high-salt COD-containing concentrated water generated by reverse osmosis treatment, the CODcr concentration is 300mg/L, the B/C ratio is less than 0.2, the total nitrogen concentration is 15-150mg/L, and the TDS is more than 5000 mg/L.
3. The method of claim 1, wherein: the advanced oxidation adopts an ozone catalyst for catalytic oxidation, and the conditions of the ozone catalytic oxidation are as follows: the volume space velocity is 0.4-0.8h-1；O3The concentration is 40-80g/m3，O3The dosage is 1000-3000 mg/L.
4. The method of claim 3, wherein: the ozone catalyst is prepared by patents CN201410706824.0, CN201410706825.5, CN201310620750.4 or CN201310621081.2, and the loading is 1/4-1/3 of the volume of the reactor.
5. The method of claim 1, wherein: the biological strengthening treatment unit adopts SBR technology, an SBR reactor firstly inoculates activated sludge according to the sludge concentration of 2000-3000mg/L, and then adds salt-tolerant COD-removing denitrification microbial agent, and the adding amount of the microbial agent is 0.01-1.0% of the volume of the wastewater treated per hour.
6. The method of claim 5, wherein: the operating conditions of the SBR are as follows: selecting 2-3 SBR series to alternately operate, wherein the operating time of the SBR series in a single group is 8-12h, aerating for 2-6h, stirring for 1-4h, circulating for 1-3 times in the single series, settling for 1h, and draining for 1 h.
7. The method of claim 1, wherein: in the salt-tolerant COD-removing denitrifying microbial agent, the volume ratio of the paracoccus denitrificans DN-3 and/or the methylobacterium SDN-3 to at least one of paracoccus FSTB-2, the Microbacterium beiense FSTB-4 and the Pseudomonas stutzeri FSTB-5 is 1: 1-5.
8. The method of claim 1, wherein: the preparation method of the salt-resistant COD-removing denitrification microbial agent comprises the following steps:
(1) respectively inoculating paracoccus FSTB-2, Microbacterium beijerinckii FSTB-4 and Pseudomonas stutzeri FSTB-5 on an FSTB solid culture medium for activation; respectively inoculating paracoccus denitrificans DN-3 and methylobacterium SDN-3 on corresponding solid culture media for activation;
(2) inoculating paracoccus FSTB-2, Microbacterium beijerinckii FSTB-4 and Pseudomonas stutzeri FSTB-5 colonies on the flat plate into corresponding FSTB liquid culture solutions respectively by using an inoculation ring, inoculating paracoccus denitrificans DN-3 and Methylobacterium SDN-3 colonies on the flat plate into corresponding liquid culture solutions respectively by using the inoculation ring, and culturing for 24-72 hours to a logarithmic growth phase under the conditions of 20-40 ℃ and 150-240rpm to obtain liquid microbial inoculum seed solutions;
(3) and (3) after the seed liquid is amplified and cultured, collecting thalli, and mixing according to a required proportion to obtain the salt-tolerant COD-removal denitrification microbial agent.
9. The method of claim 8, wherein: the culture solution used for the amplification culture of the strain related to the microbial agent is a liquid culture medium containing salt and containing nitrogen COD or actual wastewater containing salt and containing nitrogen COD, wherein the salt concentration is 5000-10000mg/L, the CODcr is 200-20000mg/L, and the total nitrogen is 50-1000 mg/L.
10. The method of claim 9, wherein: the culture conditions include temperature of 20-40 deg.C, pH of 6.0-8.0, and dissolved oxygen of 0.1-3.0 mg/L.
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